Sears 8MPL100F20B1 Ductwork and Filter Upflow/Horizontal, Furnace Control Fuse, Duct Design

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Electrical Connections

115V.60Hz.

Gr_nd

Thermostat

I

!

,

I

L ] _ _

Low Voltage

Terminal Board

NOTE: 115 VAC/6OHz/single-phase

Operating voltage range*: 127 VAC max, 104 VAC min.

* Permissible limits of voltage at which unit will operate satisfactorily

Furnace Control

The furnace control is preset at the factory with ON delay of 30 sec- onds in the heating mode. The blower OFF timing is preset at 140 seconds. If desired, the fan OFF delay can be reset to obtain the

longest delay times while still maintaining comfort levels. See "Furnace Wiring Diagram".

Furnace Control Fuse

The 24V circuit contains a 5-amp, automotive-type fuse located on furnace control. (See Figure 20) Any electrical shorts of 24V wiring during installation, service, or maintenance may cause fuse to blow. If fuse replacement is required, use only a fuse of identical size (5 amp.).

ControlConnections

Jumper24v c4> /.___ __ DiagnosticLight

.0M

" _ _ _ 25-24-98

10.Ductwork and Filter (Upflow/Horizontal)

CARBON MONOXIDE POISONING HAZARD.

Failure to properly seal duct could result in death or personal injury.

Do NOT draw return air from inside a closet or utility

room where furnace is located. Return air duct

MUST be sealed to furnace casing.

Duct Connections

This furnace may be installed in only a bottom or side return-air

duct application. Return air duct connections through the back of the furnace is NOT permitted.

Upflow ONLY: Side return-air duct connections can be made by cutting out the embossed area shown in Figure 21. A plugged hole is provided at each furnace side duct location to help start cut- ting the opening. Side duct connections are NOT permitted in hori- zontal flow applications.

Upflow and Horizontal Flow: Bottom return-air duct connec- tions can be made by removing the knockout panel in the furnace base. Do NOT remove knock-out except for a bottom return-air duct connection.

Cutting Side Return Air Opening

Plugged ,,Starting

0 /_/'I'I / Hole

I

Duct Design

Design and install air distribution system to comply with Air Condi- tioning Contractors of America manuals or other approved meth- ods that conform to local codes and good trade practices.

When the furnace is located in an area near or adjacent to the living area, the system should be carefully designed with returns to mini-

mize noise transmission through the return air grille. Any blower moving a high volume of air will produce audible noise, which could

be objectionable when the furnace is located very close to a living

_]

441 01 2613 02

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Contents 80+SingleStage Drip-Leg Upstream of Gas Valve? Yesi NOI AddressLimit Opens Dealer NameSafe Installation Requirements FIRE, EXPLOSION, and Asphixiation HazardLocation and Clearances Installation RequirementsFrozen Water Pipe Hazard Carbon Monoxide Poisoning HazardFurnace Dimensions and Clearances N8MPN/LDimensional Information ReturnAirDimensions and Clearances *8MPN/L Models Installation PositionsFurnace Installation 41IDownflow Typical Horizontal InstallationHorizontal Fire HazardSide Venting Pressure Switch RelocationRotating the Venter Assembly Burn HazardOutdoor Combustion Air Method Air Openings and Connecting DuctsCombustion & Ventilation Air RequirementsIndoor Combustion Air ThisinstallationNOTapprovedin CanadaSoffitVen FreeAreaCategory I Safe Venting Requirements MINIMUMSPACEVOLUMEFOR100%COMBUSTIONVentilation Air Andventilationair Fromindoors ftVent Check Venting and Combustion Air CheckVenting to Existing Masonry Chimney Lowing CheckVent Termination Category I Furnaces With External Power VentersHorizontal Venting Combined Venting into a Masonry ChimneyIviventterminal Failure to properly vent this furnace could result Masonry Chimney VentingChimney Inspection Authority having jurisdiction approvesChimney Inspection Chart SllExterior Masonry Chimney FAN+NAT Installations withType-B Double-Wall Vent Connectors Nfpa & AGAGas Pressures Gas Supply and PipingVentdampersonanyapplianceconnectedto the common vent Typical Gas Piping N8MPPiping with Close Nipples and Standard Elbows Left Side Gas Supply Piping N8MPPiping with Street Elbows Piping with Street Elbows Final CheckTypical Gas Piping aMP Fire or Explosion HazardBox Relocation Electrical WiringPower Supply Wiring ThermostatFurnace Control Fuse Ductwork and Filter Upflow/HorizontalFurnace Control Duct DesignHigh-Velocity Air Filter Sizes max600FPM Duct Installation RequirementsFilters Risk of Reduced Furnace LifeAddition Of Air Conditioning Optional Filter Rack Installation Side ReturnInternal Filter in Bottom- Return Installation 20 x 25 Optional Filter RackOutlet Duct Flange Sub-bases For Combustible Floors DimensionsDuctwork and Filter Downflow Sub-Bases for Combustible Floors Furnace OnlyAdapter Box Exploded View of Sub-Base for Furnace onlySub-base for Combustible Floors Downflow Coil Non-Combustible FloorManifold Gas Pressure Adjustment Checks and AdjustmentsStartup Natural Gas Input Rating Check Orifice SizingWiseto decreasemanifoldpressureand clockwiseto Operation Above 2000 AltitudeChanging Orifices High Altitude Air Pressure SwitchI! i! i I! i! i! i! i Natural GAS Manifold Pressure w.cFIRE, EXPLOSION, Unit Damage Hazard LP ConversionMain Burner Flame Check Removing NOx insertsIgnitor Location Hard Wired Continuous-Fan OperationChanging Blower Speed Reduced Furnace Life HazardFIRE, EXPLOSION, or Carbon Monoxide Poisoning Hazards Ous-fanoptionThisconnectionisintendedfor.thelow speed moSeparate speed selections for Heat, Cool, Electrical SHOCK, Fire or Explosion HazardContinuous Circulating Fan G Request Sequence of Operation & DiagnosticsContinuous Circulating Fan Hard-Wired Cont Request Heating W RequestControl Board Control Board Diagnostic Codes See FigureHeating Request with Gas Shut Off OFFN8MPN075F16B1 N8MPL075F16B1 N8MPN050B12B1 N8MPL050B12B1Denotes Brand 44101261302 This Data is Subject to Change Without NoticeGeneral InputBtuh PSC/II2 PSC/I/2 441olLimits& Controls Natto LP NAHA001LP11729588MPN NatlLP NatlLP NatlLP NatlLP NatlLP NatlLP NatlLP NatlLPPSC/I/2 PSCII/2 PSCI3/4 441Ol261302 N8MPN/L075F16& *8MPN/L075F1613* DenotesBrand N8MPN/L050B12& *8MPN/L050B121 DenotesBrandN8MPN/L075B12& *8MPN/L075B121 * Denotes Brand N8MPN100F14& *8MPN100F141 Denotes BrandISMPN150J2027* DenotesBrand N8MPN/L125J222644101261302 Ndif Eutrali SwitchII,DUER%I .ICAPACITOR a Junction Relay Heatimhio16 \ \ uReplacement Parts N8MPN NaturalGas NsmpnKey Description Part 12B1 Replacement Parts N8MPN NaturalGasIoof 14B1 20B120A1 22A1 Parts Not IllustratedReplacement Parts N8MPL NaturalGas N8MPLKey Description Part 050B 075F NSMPL125J22B1 NSMPLO75B12B1NSMPLIOOF2OB1 N8MPLIOOJ2OB1 NsmplParts for *8MPN/L IReplacement Parts *8MPN NaturalGas Panel Top Partnot Illustrated Parts *8MPL NaturalGas Key Description075B Replacement Parts 8MPL NaturalGas

8MPN125J20B1, N8MPL050B12B1, N8MPL100F20B1, 8MPN050B12B1, 8MPL075F16B1 specifications

Sears has long been recognized as a prominent name in the retail and home appliance industry, and its commitment to quality is evident in its range of products, including the N8MPN100F20B1, N8MPN100F14B1, 8MPL125J20B1, 8MPN100J20B1, and 8MPN075B12B1 models. These products combine advanced technology with user-friendly features to meet the demands of modern consumers.

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